Hacksaw-frame.



D. L. MURGHEY.

HAOKSAW FRAME.

APPLIOATION FILED 111:0. 2a, 1911.

1,063,828. Patented June 3, 1913.

WITNESSES IN V EN TOR J hwy 2.1. Jun/65 TINT T FTCE.

DAVID L. MURCHEY, 013 DETROIT, MICHIGAN.

HACKSAW-FRAME.

Specification of Letters Patent.

: Patented June3,1.913.

Application filed December 29, 1911. Serial No. 668,409.

To all whom it may concern Be it known that It, l.)AV1l) L. Munoiinr, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of .lvlichigan, have invented certain new and useful Improvements in liacksaw-Frames, of which the following is a specification, reference being had therein to the accon'ipanying drawings.

This invention relates to saw-frames and more particularly to that class generally known under the name of hack-saw frames, and it has for one of its objects the provision of a frame in which the saw may be held so as to bring both marginal edges of the blade under equal tension.

The invention has, furthermore, for its object the improved organization and construction of the sawholder, as will be here inafter described and be particularly detined in the claims.

The invention has been clearly illustrated in the accompanying drawings, in which,

Figure 1 is a side view of hack-saw frame embodying my invention; Fig. .2 is an enlarged front view of one end of the sawholder 720 so; Fig. 3 is a horimntal section of line 3, 3 of .llig. 2.

Briefly stated, the present invention has for its particular object the provision of a saw-holder which engages both, longitudinal edges of the saw-blade in such a, manner that all unevenness of tension, or bruikling of the edges is avoided. f accomplish this object by supporting the saw as near :in alinement with both of said edges as possible, and the holder which carries the holding device is swiveled so as to serve as an equalizer, one of such devices being preferably provided at each end of the saw and attached to the frame.

Referring to the drawings, 1() denotes a hack-saw frai'ne which may be of any ordinary or desired construction, and has droparms 10', 10 adapted to receive the ends of a saw-blade 11, which latter may be stretched tightly in proportion to the resiliency of the arms 10', 10. In the present instance the saw-blade 11 has each of its ends provided with notches 'l 1, 11 (see Fig. 2), to tit over and be engaged by a pair of undercut hookshapcd projections or lugs 12, 13, formed on a plate lt-twhich has a central hub 15 in diamctrical alincmcnt with said lugs, and rotatable in a corresponding recess '16 provided therefor in the saw-holder proper. The latter comprises a head 17, and a shank l8 the outer end of which is screw-threaded as shown to receive a nut-handle 1S) exteriorly of the saw frame arm 10' and so arranged that a rotation of the handle 19 in one direction will draw the head toward that end, and with it the disk ft. The other end of the saw-blade 11 is similarly formed with notches 20 and 20 adapted to be engaged by a pair of hook-shaped members 21, 2.2, respectively, mounted on a disk similar to the disk H; above Ir-scribed. The latter is similarly supported in the frame arm l0", and each disk is held in position by a bolt 23 passing freely through an aperture in the head 17, or in the arm 10, as the case may be; while it, is in scrcw-threaded engagement with the saw-s11pporting disk pertaining to that particular end of the saw.

From the foregoing description it will be evident that, inasmuch as each disk 14- is at perfect liberty to turn on its hub, both longitudiual margins of the saw will be subjected to tension, and this tension will be the same in both instances by virtue of the s\\'i\"cl-support of the disks 'l-l. Practice has tleinonstrated that these supports for the saw not only lengthen the life of the same but keep the blade in proper form.

It should be understood that means may be provided on the frame whereby the plane of the saw may be varied relative to the frame, as is counnon in devices of this character. it should also be understood that many changes can be made in the particular constructitm of the supporting swivels, and also in the frame itself, without departing from the spirit of the invention.

The colnbimition with a frame, and a saw holder carried thereby and having in its side face a recess, of a disk having a hub entering said recess and journaled therein, means In testimony whereof I aflix my signature for holding sald disk agalnst the holder, a 1n the presence of two Witnesses.

saw havin notches in its opposite marginal edges, and a pair of devices projecting from DAVID MURCHEY' the side of said disk at diametrically-oppo- Witnesses:

site points of the disk-axis and engaging CHAS. F. Sorrmsnz,

said notches, respectively. J. A. DOUGHERTY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. O. 

